Type Expansion Valve, air conditioning. AUDI A6 C5 Avant (4B5) RS6 plus quattro Estate Petrol 04/2004 01/2005 AWD 40 480 353. AUDI A6 C5 (4B2) 2.5 TDI Saloon Diesel 07/1997 01/2005 FWD 24 150 110. AUDI A6 C5 (4B2) 2.5 TDI Saloon Diesel 02/2000 01/2005 FWD 24 180 132.